Okla. Admin. Code § 252:740-15-7

Current through Vol. 41, No. 19, June 17, 2024

Section 252:740-15-7 - Assessment of Public and Private Water Supply support

(a)Scope. The provisions of this Section shall be used to determine whether the beneficial use of Public and Private Water Supply or any subcategory thereof designated in OAC 252:730 for a waterbody is supported.

(b)Toxicants.

(1) The Public and Private Water Supply beneficial use designated for a waterbody shall be deemed to be fully supported with respect to any substance with criteria for such use listed in OAC 252:730 Appendix G if the sample concentrations from that waterbody do not exceed the criterion for that substance prescribed in OAC 252:730 Appendix G in more than 10% of the measurements, or if drinking water use restrictions are not in effect.

(2) The Public and Private Water Supply beneficial use designated for a waterbody shall be deemed to be not supported with respect to any substance with criteria for such use listed in OAC 252:730 Appendix G if the sample concentrations from that waterbody exceed the criterion for that substance prescribed in OAC 252:730 Appendix G in more than 10% of the measurements, or if drinking water use restrictions are put in effect by an agency with jurisdiction that require closure of the water supply.

(c)Bacteria. The screening level for total coliform bacteria shall be 5000 colonies per 100 ml. The tests for use support shall follow the default protocol in OAC 252:740-15-4.

(d)Threatened water supplies. Waters of the state designated in OAC 252:730 as Public and Private Water Supply shall be presumed to be threatened when toxicants are detected but do not exceed the applicable criteria prescribed in OAC 252:730 Appendix G, or some drinking water use restrictions have been put into effect by an agency with jurisdiction, or the potential for adverse impacts to water quality exists, or more than one such conditions exist.

(e)Oil and grease.

(1) The Public and Private Water Supply beneficial use designated for a waterbody shall be deemed to be fully supported with respect to oil and grease if a visible sheen or bottom deposits of oil or grease are observed on that waterbody in 10% or less of the observations, and drinking water use restrictions that require more than conventional treatment related to oil and grease have not been put into effect by an agency with jurisdiction.

(2) The Public and Private Water Supply beneficial use designated for a waterbody shall be deemed to be not supported with respect to oil and grease if a visible sheen or bottom deposits of oil or grease are observed on that waterbody in more than 10% of the observations, or drinking water use restrictions that require more than conventional treatment related to oil and grease have been put into effect by an agency with jurisdiction.

Okla. Admin. Code § 252:740-15-7

Adopted by Oklahoma Register, Volume 40, Issue 6, December 1, 2022, eff. 10/25/2022

Adopted by Oklahoma Register, Volume 40, Issue 24, September 1, 2023, eff. 9/15/2023